CIS 140 Fundamentals of Wireless LANs by mgb63241

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									CIS 140 Fundamentals of
     Wireless LANs
Wireless Devices: Clients, Bridges,
          Access Points



                                      1
            Wireless Clients
• Common operating systems have integrated
  tools
• Network Manager – Linux
• Mac Airport Configuration Utility - Apple
• Windows WZC (Wireless Zero Configuration)




                                              2
              Windows WZC
• WZC in XP
• WLAN Auto Configuration in Vista
• Provides most basic options needed for profile
  configuration
• Windows allows the use of NIC vendor utilities
• Uses either vendor utility OR WZC NOT both



                                               3
                WZC Profiles
• Manual
  – A WLAN is detected but the computer was not
    previously connected to it
• Automatic
  – An association was previously configured




                                                  4
Select a Network




                   5
Security Warning




                   6
Connected




            7
Profile Creation




                   8
Profiles




           9
             WZC Summary
• The WZC is limited in function
• The vendor utility might have more functions
  and be more secure
• WZC has some security risks




                                                 10
                   Linux
• Linux has a command line interface to
  configure and troubleshoot wireless network
  connections - iwconfig
• Different OS distributions
• Network Manager is a GUI tool – Ubuntu,
  Fedora, KDE, etc.



                                                11
                       Bridges

• Designed to connect two or more networks, typically
  located in different buildings
• Deliver high data rates and throughput for data-
  intensive, LOS applications
• Connect hard-to-wire sites, noncontiguous floors,
  satellite offices, school or corporate campus settings,
  temporary networks, and warehouses




                                                            12
             Bridging Defined

• Bridges are
  used to
  connect two or
  more wired
  LAN’s, usually
  located within
  separate
  buildings, to
  create one
  large LAN.
                                13
        Traditional WAN Connectivity

            RBOC
                      DS1

                      DS1
              DS3



                                 Monthly Leased Line


New remote office
- No DS1 connection              RBOC provides guaranteed
available                        level of service via a
                                 Service Level Agreement
                            14
                                 (SLA)
     802.11 Connectivity

RBOC

              2 Mbps




                 2 Mbps

                            New building connected
22 Mbps
                            Self managed



     5 Mbps

                       15
     Optional 2.4GHz Antennae for Long Range




• 13.5 dBi Yagi                           • 21 dBi Solid Dish
    Distances over                            For distances up to
         7.3 miles @ 2 Mbps                       25+ miles @ 2 Mbps
         11.7 Km @ 2 Mbps                         40+ Km @ 2 Mbps
         3.6 miles @ 11 Mbps                      20.5 miles @ 11 Mbps
         5.8 Km @ 11 Mbps                         33 Km @ 11 Mbps

Note: Distances include 50 feet of low loss cable and 10 dB fade margin
                                                                          16
      802.11b Bridge Application: School District

   Richardson                                   Weaver-
                                  Roberts
   Elementary                                   Special
                                  Middle School
   Yagi                                         Education
                                  Dish
                                                Dish



                                         UNIVERSIT Y


Bode            High School 2
Elementary      Bridges
Yagi            One 12 dBi omni                               Lincoln
                One Dish            Administration            Elementary
                                    2 Bridges                 Yagi
       Channel #1                   One 12 dBi omni
       Channel #6                   One Yagi
                                                          Bolich
       Channel #11     Price
                                        Dewitt Elementary Middle
                       Elementary                         School
                                        Yagi
                       Yagi                               Yagi     17
            Path Loss Considerations




The following are needed to
determine coverage
·     Antenna Gain
·     Transmitter Power
·     Receiver Performance
·     Cable Losses
·     Environmental Structures

                                       18
                 Access Points
• AN AP is a WLAN transceiver that can act as a
  center point of a standalone wireless network
• AN AP can also be used as a connection point
  between wired and wireless networks
• There are 2 types of access points
  – Autonomous APs (standalone)
  – Lightweight APs
     • Controlled and monitored by a wireless LAN controller


                                                               19
                AP Overview
•   Access Point Connection
•   Basic Configuration
•   Verifying configuration
•   Configure Services




                              20
   Reset the AP to Factory Defaults




• The MODE button is used to reset the AP to factory
  defaults



                          21
Connecting to the AP (Configuration)



                    Telnet/SSH




Wired OR Wireless                Wireless: Requires Association




                         22
   Connecting to the AP (Configuration)

10.0.0.101/24
                                                           10.0.0.1/24
                         10.0.0.102/24

                          )   )   ) ))


• Console: 9600-8-N-1-None
   OR
• Ethernet or Wireless adapter:
   – Unless routed, be sure the IP addresses are on the same subnet.
                                   23
                             Lab Setup                    Configuring
                                                          AP1 is easy!

                 Hey, what                         AP1
             happened to my
             settings on AP2!
                                               10.1.0.1




                                                   AP2
                                        10.2.0.1

• In the lab, you need to make sure you are configuring
  the AP that you think you are!
Note: Humor provided by Rick Graziani   24
Cisco AP Factory Default Settings




                      255.255.255.224 (/27)




                25
    Configure IP address and SSID with
                   IPSU




•   IP Setup Utility (IPSU) can only change the IP address and SSID
    of the AP from their default settings .
•   After the IP address and SSID have been changed, IPSU cannot
    change them again unless the mode button is held down.
•   Use a computer on the wired LAN to communicate with the AP
    through a hub on the wired LAN.
•   IPSU uses IP multicast to communicate with the AP
                                26
           Using the CLI

          ap>enable




• Very similar to the
  Router/Switch IOS
  commands            27
Saving Configurations




                        28
Using the GUI
       • Different tabs for basic
         AP configuration
       • More options on the CLI




                                29
Online Help




              30
Home Summary Page (IOS)
     Trans.




        MAC address returned
        when pinging the AP
        from wired or wireless
        client.



                         BSSID BSSID




                   31
Association




              32
                  AP - IP Address




• BVI allows all the interfaces to be grouped under one IP
  address
• Single IP address is used for AP management through Dot 11
  or Ethernet Interfaces
• Configure the AP’s IP address on the BVI only, NOT the
  individual interfaces
                              33
     IP Address Configuration




Same IP address whether you are
connecting via the wired or wireless
interface. (For AP Configuration)
                                       34
BVI in CLI




             35
Express Security




                   36
Network Interfaces Summary




                             37
Security Tab




               38
Services




           39
Hot Standby (Services)




                         40
Hot Standby




              41
                       HTTP




• Enables Web-based GUI management by providing
  support for HTML Web pages and Common Gateway
  Interface (CGI) scripts using common Web browsers
• If HTTP is disabled, the management system is
  accessible only through Telnet or the console
                          42
               HTTP Help Files




The help files can be copied to the hard drive of the
computer which is used to manage the wireless LAN
                                                        43
System Software




                  44
Event Log




            45
                    QoS – F.Y.I.
• QoS is disabled by default
• The most important guideline in QoS deployment is to
  be familiar with the traffic on the wireless LAN
• It is important to know the applications used by
  wireless client devices, the delay sensitivity of the
  applications, and the amount of traffic associated with
  the applications
• QoS does not create additional bandwidth for the
  wireless LAN
• Rather it helps control the allocation of bandwidth. If
  there is adequate bandwidth on the WLAN, QoS may
  not be needed
                           46
              Labs for this Week
• Cisco Academy Labs – posted in Blackboard
• Module 5 (Access Points Labs)
• 5.2.2 – Basic AP settings – GUI & CLI
• 5.2.4 – CLI Practice
• 5.2.5 – Do NOT do!
• 5.3.5 – Ethernet Interface Config
• 5.4.4 – Radio Config via GUI – good lab
• 5.4.5 – Radio Config via CLI – good lab
• 5.4.8 – AP as a repeater
• Choose at least one lab – green are more beginning labs,
  blue more advanced
• Submit answers to questions and final configuration
  (show run)
                                                             47

								
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